This partially implements the LSL function to set the response

type for an HTTP request. Since the "official" LSL function limits
the use of the response type, it is implemented as osSetContentType
with a string for the content mime type and a threat level of high.
With this function you should be able to implement rather functional
media-on-a-prim application with much less difficulty.

OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs

@@ -365,5 +365,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api.Interfaces
         /// </summary>
         /// <returns>Rezzing object key or NULL_KEY if rezzed by agent or otherwise unknown.</returns>
         LSL_Key osGetRezzingObject();
+
+        /// <summary>
+        /// Sets the response type for an HTTP request/response
+        /// </summary>
+        /// <returns></returns>
+        void osSetContentType(LSL_Key id, string type);
     }
 }